<!DOCTYPE html>
<html>
<head>
    <title>鱼仔技术2.0</title>
    <meta name="renderer" content="webkit">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
    <meta name="apple-mobile-web-app-status-bar-style" content="black">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="format-detection" content="telephone=no">
    <link rel="stylesheet" href="/static/layui/layui/css/layui.css" media="all"/>
    <link rel="stylesheet" href="/static/layui/css/public.css" media="all"/>

    <style>
        body {
            background: #060e1b;
            overflow: hidden;
        }

        canvas {
            opacity: 0.7;
        }


    </style>

</head>
<body>
<canvas id="canvas" width="1221" height=1200>

</canvas>
<script>
    function project3D(x, y, z, vars) {
        var p, d;
        x -= vars.camX;
        y -= vars.camY - 8;
        z -= vars.camZ;
        p = Math.atan2(x, z);
        d = Math.sqrt(x * x + z * z);
        x = Math.sin(p - vars.yaw) * d;
        z = Math.cos(p - vars.yaw) * d;
        p = Math.atan2(y, z);
        d = Math.sqrt(y * y + z * z);
        y = Math.sin(p - vars.pitch) * d;
        z = Math.cos(p - vars.pitch) * d;
        var rx1 = -1000;
        var ry1 = 1;
        var rx2 = 1000;
        var ry2 = 1;
        var rx3 = 0;
        var ry3 = 0;
        var rx4 = x;
        var ry4 = z;
        var uc = (ry4 - ry3) * (rx2 - rx1) - (rx4 - rx3) * (ry2 - ry1);
        var ua = ((rx4 - rx3) * (ry1 - ry3) - (ry4 - ry3) * (rx1 - rx3)) / uc;
        var ub = ((rx2 - rx1) * (ry1 - ry3) - (ry2 - ry1) * (rx1 - rx3)) / uc;
        if (!z) z = 0.000000001;
        if (ua > 0 && ua < 1 && ub > 0 && ub < 1) {
            return {
                x: vars.cx + (rx1 + ua * (rx2 - rx1)) * vars.scale,
                y: vars.cy + y / z * vars.scale,
                d: (x * x + y * y + z * z)
            };
        } else {
            return {d: -1};
        }
    }


    function elevation(x, y, z) {

        var dist = Math.sqrt(x * x + y * y + z * z);
        if (dist && z / dist >= -1 && z / dist <= 1) return Math.acos(z / dist);
        return 0.00000001;
    }


    function rgb(col) {

        col += 0.000001;
        var r = parseInt((0.5 + Math.sin(col) * 0.5) * 16);
        var g = parseInt((0.5 + Math.cos(col) * 0.5) * 16);
        var b = parseInt((0.5 - Math.sin(col) * 0.5) * 16);
        return "#" + r.toString(16) + g.toString(16) + b.toString(16);
    }


    function interpolateColors(RGB1, RGB2, degree) {

        var w2 = degree;
        var w1 = 1 - w2;
        return [w1 * RGB1[0] + w2 * RGB2[0], w1 * RGB1[1] + w2 * RGB2[1], w1 * RGB1[2] + w2 * RGB2[2]];
    }


    function rgbArray(col) {

        col += 0.000001;
        var r = parseInt((0.5 + Math.sin(col) * 0.5) * 256);
        var g = parseInt((0.5 + Math.cos(col) * 0.5) * 256);
        var b = parseInt((0.5 - Math.sin(col) * 0.5) * 256);
        return [r, g, b];
    }


    function colorString(arr) {

        var r = parseInt(arr[0]);
        var g = parseInt(arr[1]);
        var b = parseInt(arr[2]);
        return "#" + ("0" + r.toString(16)).slice(-2) + ("0" + g.toString(16)).slice(-2) + ("0" + b.toString(16)).slice(-2);
    }


    function process(vars) {


        if (vars.points.length < vars.initParticles) for (var i = 0; i < 5; ++i) spawnParticle(vars);
        var p, d, t;

        p = Math.atan2(vars.camX, vars.camZ);
        d = Math.sqrt(vars.camX * vars.camX + vars.camZ * vars.camZ);
        d -= Math.sin(vars.frameNo / 80) / 25;
        t = Math.cos(vars.frameNo / 300) / 165;
        vars.camX = Math.sin(p + t) * d;
        vars.camZ = Math.cos(p + t) * d;
        vars.camY = -Math.sin(vars.frameNo / 220) * 15;
        vars.yaw = Math.PI + p + t;
        vars.pitch = elevation(vars.camX, vars.camZ, vars.camY) - Math.PI / 2;

        var t;
        for (var i = 0; i < vars.points.length; ++i) {

            x = vars.points[i].x;
            y = vars.points[i].y;
            z = vars.points[i].z;
            d = Math.sqrt(x * x + z * z) / 1.0075;
            t = .1 / (1 + d * d / 5);
            p = Math.atan2(x, z) + t;
            vars.points[i].x = Math.sin(p) * d;
            vars.points[i].z = Math.cos(p) * d;
            vars.points[i].y += vars.points[i].vy * t * ((Math.sqrt(vars.distributionRadius) - d) * 2);
            if (vars.points[i].y > vars.vortexHeight / 2 || d < .25) {
                vars.points.splice(i, 1);
                spawnParticle(vars);
            }
        }
    }

    function drawFloor(vars) {

        var x, y, z, d, point, a;
        for (var i = -25; i <= 25; i += 1) {
            for (var j = -25; j <= 25; j += 1) {
                x = i * 2;
                z = j * 2;
                y = vars.floor;
                d = Math.sqrt(x * x + z * z);
                point = project3D(x, y - d * d / 85, z, vars);
                if (point.d != -1) {
                    size = 1 + 15000 / (1 + point.d);
                    a = 0.15 - Math.pow(d / 50, 4) * 0.15;
                    if (a > 0) {
                        vars.ctx.fillStyle = colorString(interpolateColors(rgbArray(d / 26 - vars.frameNo / 40), [0, 128, 32], .5 + Math.sin(d / 6 - vars.frameNo / 8) / 2));
                        vars.ctx.globalAlpha = a;
                        vars.ctx.fillRect(point.x - size / 2, point.y - size / 2, size, size);
                    }
                }
            }
        }
        vars.ctx.fillStyle = "#82f";
        for (var i = -25; i <= 25; i += 1) {
            for (var j = -25; j <= 25; j += 1) {
                x = i * 2;
                z = j * 2;
                y = -vars.floor;
                d = Math.sqrt(x * x + z * z);
                point = project3D(x, y + d * d / 85, z, vars);
                if (point.d != -1) {
                    size = 1 + 15000 / (1 + point.d);
                    a = 0.15 - Math.pow(d / 50, 4) * 0.15;
                    if (a > 0) {
                        vars.ctx.fillStyle = colorString(interpolateColors(rgbArray(-d / 26 - vars.frameNo / 40), [32, 0, 128], .5 + Math.sin(-d / 6 - vars.frameNo / 8) / 2));
                        vars.ctx.globalAlpha = a;
                        vars.ctx.fillRect(point.x - size / 2, point.y - size / 2, size, size);
                    }
                }
            }
        }
    }

    function sortFunction(a, b) {
        return b.dist - a.dist;
    }

    function draw(vars) {

        vars.ctx.globalAlpha = .15;
        vars.ctx.fillStyle = "#000";
        vars.ctx.fillRect(0, 0, canvas.width, canvas.height);

        drawFloor(vars);

        var point, x, y, z, a;
        for (var i = 0; i < vars.points.length; ++i) {
            x = vars.points[i].x;
            y = vars.points[i].y;
            z = vars.points[i].z;
            point = project3D(x, y, z, vars);
            if (point.d != -1) {
                vars.points[i].dist = point.d;
                size = 1 + vars.points[i].radius / (1 + point.d);
                d = Math.abs(vars.points[i].y);
                a = .8 - Math.pow(d / (vars.vortexHeight / 2), 1000) * .8;
                vars.ctx.globalAlpha = a >= 0 && a <= 1 ? a : 0;
                vars.ctx.fillStyle = rgb(vars.points[i].color);
                if (point.x > -1 && point.x < vars.canvas.width && point.y > -1 && point.y < vars.canvas.height) vars.ctx.fillRect(point.x - size / 2, point.y - size / 2, size, size);
            }
        }
        vars.points.sort(sortFunction);
    }


    function spawnParticle(vars) {

        var p, ls;
        pt = {};
        p = Math.PI * 2 * Math.random();
        ls = Math.sqrt(Math.random() * vars.distributionRadius);
        pt.x = Math.sin(p) * ls;
        pt.y = -vars.vortexHeight / 2;
        pt.vy = vars.initV / 20 + Math.random() * vars.initV;
        pt.z = Math.cos(p) * ls;
        pt.radius = 200 + 800 * Math.random();
        pt.color = pt.radius / 1000 + vars.frameNo / 250;
        vars.points.push(pt);
    }

    function frame(vars) {

        if (vars === undefined) {
            var vars = {};
            vars.canvas = document.querySelector("canvas");
            vars.ctx = vars.canvas.getContext("2d");
            vars.canvas.width = document.body.clientWidth;
            vars.canvas.height = document.body.clientHeight;
            window.addEventListener("resize", function () {
                vars.canvas.width = document.body.clientWidth;
                vars.canvas.height = document.body.clientHeight;
                vars.cx = vars.canvas.width / 2;
                vars.cy = vars.canvas.height / 2;
            }, true);
            vars.frameNo = 0;

            vars.camX = 0;
            vars.camY = 0;
            vars.camZ = -14;
            vars.pitch = elevation(vars.camX, vars.camZ, vars.camY) - Math.PI / 2;
            vars.yaw = 0;
            vars.cx = vars.canvas.width / 2;
            vars.cy = vars.canvas.height / 2;
            vars.bounding = 10;
            vars.scale = 500;
            vars.floor = 26.5;

            vars.points = [];
            vars.initParticles = 700;
            vars.initV = .01;
            vars.distributionRadius = 800;
            vars.vortexHeight = 25;
        }

        vars.frameNo++;
        requestAnimationFrame(function () {
            frame(vars);
        });

        process(vars);
        draw(vars);
    }

    frame();
</script>


<div  style="position: absolute;left: 0px;right: 0px;top:0px; opacity: 0.8; padding:0 20px; width:325px; height:260px; position:absolute; left:50%; top:50%; margin:-150px 0 0 -150px; -webkit-box-sizing:border-box;-moz-box-sizing:border-box; -o-box-sizing:border-box; box-sizing:border-box; background-color:#000;-webkit-border-radius:5px; -moz-border-radius:5px; border-radius:5px; box-shadow:0 0 50px #009688;">
    <form class="layui-form layui-form-pane" action="{% url "login" %}" method="POST">
        {% csrf_token %}
        <div class="login_face"><img src="/static/images/face.jpg" class="userAvatar"></div>
        <div class="layui-form-item ">
            <label class="layui-form-label">用户名</label>
            <div class="layui-input-block">
                <input type="text" placeholder="请输入用户名" autocomplete="off" id="username" name='username'
                       ,class="layui-input"  style="line-height: 34px;" lay-verify="required">
            </div>
        </div>

        <div class="layui-form-item">
            <label class="layui-form-label">密码</label>
            <div class="layui-input-block">
                <input type="password" placeholder="请输入密码" autocomplete="off" id="password" name='password'
                       ,class="layui-input" style="line-height: 34px;" ,lay-verify="required">
            </div>
        </div>


        <div style="width: 200px;margin:0px 0 0 50px">

            <button class="layui-btn layui-btn-fluid "  lay-filter="login" lay-submit>登陆</button>

        </div>


    </form>


</div>


</body>
</html>
